Decompilation error: Tried to pushaf on something that is not a var

[craftersshaft]

Describe the bug

The decompiler throws an exception when decompiling code, and currently the game is on the latest GM compiler. Opening the game with the Underanalyzer build seems to work fine, but saving the code makes another error happen.

Reproducing steps

1. Open data.win in UndertaleModTool
2. open Code > gml_Object_obj_char_Crack_Step_0

   System.InvalidOperationException: Tried to pushaf on something that is not a var
   at UndertaleModLib.Decompiler.Decompiler.DecompileFromBlock(DecompileContext context, Dictionary`2 blocks, Block block, List`1 tempvars, Stack`1 workQueue) in D:\a\UndertaleModTool\UndertaleModTool\UndertaleModLib\Decompiler\Decompiler.cs:line 647
   at UndertaleModLib.Decompiler.Decompiler.DecompileFromBlock(DecompileContext context, Dictionary`2 blocks, Block block) in D:\a\UndertaleModTool\UndertaleModTool\UndertaleModLib\Decompiler\Decompiler.cs:line 800
   at UndertaleModLib.Decompiler.Decompiler.Decompile(UndertaleCode code, GlobalDecompileContext globalContext, Action`1 msgDelegate) in D:\a\UndertaleModTool\UndertaleModTool\UndertaleModLib\Decompiler\Decompiler.cs:line 1465
   at UndertaleModTool.UndertaleCodeEditor.<>c__DisplayClass58_1.<DecompileCode>b__1() in D:\a\UndertaleModTool\UndertaleModTool\UndertaleModTool\Editors\UndertaleCodeEditor.xaml.cs:line 700

Setup Details

UndertaleModTool Bleeding Edge (git: 9f4f13a)
Windows 10
Supra Smash Bross Devolution https://reynlynxpsi.itch.io/supra-smash-bross

[colinator27]

Likely properly fixed with #2056.